Improvement in patterns and core-bars for casting pipes



2 Sheets--Sheet l.

l. HUWDON.

Patterns and Core-Bars fu.;` vCasting Pipes.

Patented June 16, 1874.

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2'Sheets--Sheet 2.

3.1. HWDN. `Patterns-and Core-Bars for Casting Pipes.. No.l52,l`l2.-

Patented June 16,1874.

{M1/*en or fig/7. Kw/da( UNITED S'rA'rEs ROB ERT J. HOWDON,

PATENT OFFICE.

OF CINCINNATI, OHIO, ASSIGNOR TO MARY E. R. HOWDON, vOF SAME PLAGE.

IMPROVEMENT IN PATTERNS AND CORE-BARS FOR CASTING PIPES.

Speccation forming part of Leters Patent No. 152,112, dated J une 15,1874; application filed April 24, 1874.

To all whom it may concern:

Be it known that I, ROBERT J. HowDoN, of Cincinnati, Hamilton county,State of Ohio, have invented a certain new and useful Improvement inPatterns and Core-Bars for Mold in g and Casting Pipe, of which thefollowing is a specication:

My invention relates to devices for forming the exterior mold andinterior core for the formation between the two of cast pipe or votherhollow castings; and my invention consists, Erst, in a peculiarconstruction of a pattern by which the exterior mold is formed, thepattern being made hollow, and representing both exteriorly andinteriorly the proposed shape and size ot' the casting, and being fittedwith loose detachable prints/7 which, in connection with this hollowpattern and suitable core-bar, enable the melder to form the core in thepattern itself, and in the molded ends left bythe detachablecore-prints, the object being to attain great speed in molding suchware, and precise accuracy and uniform thickness of metal composing thepipe or other ware in cross-section; second, in the provision in theconstruction of the core-bar of guides or ways upon it for theattachment yand guidance of a rammer, by which the core may be formedaround the bar while the latter is in place in the hollow pattern;third, in a certain peculiar device for connecting' the ends of thecore-bar to the flask, by which it is prevented from oscillation orother movement while in place; fourth, in the peculiar construction of arammer fitted to slide upon the guides of the core-bar, and providedwith projecting` vent-wires, which, in the operation of molding, willform and preserve vent-apertures throughout the entire length of thecore; `fifth, in connection with the detachable end core-bar of anadjustable guide for supporting this end of the core-bar during theoperation of ramming the core.

Figure l is a perspective view of the ribbed core-bar. Fig. 2 is aperspective view of the rammer. Fig. 3 is a sectional perspective viewwith a detachable wing attached to the bar. Fig. 4 is a cross-section ofthe core-bar and rammer. Fig. 5 represents the device for securing theend of the core-bar against displacement. Fig. 6 is a cross-section ofthe ilask, pattern, and core-bar with the sand rammed up. Fig. 7 is asection of the ilask through the line x x of Fig. 6, showing the processof ramming the core. Fig. 8 is a perspective view of the end of thecore-bar with one form of detachable end attached. Fig. 9 is aperspective view of a modification in the form of the core-bar, one thatwill permit the core to be rammed in both halves of the ask at the sametime. Fig. l() is a perspective view of the rammer for the bar shown inFig. 9. Fig. 11 is a perspective view ofthe adjustable guide forsupporting the bar during the operation of ramming and during theoperation of casting. Fig. 12 represents vertical sections of a core-barwith the detachable prints in two positions, one for the formation ofthe exterior mold, and one for the formation of the core within the moldso formed. Fig. 13 is a cross-section of the iaslz, pattern, andcore-bar when the ramming is being completed. Fig. 14. is across-sectionof the core-bar and circular rammer. Fig. 15 is a verticalsection of the flask, pattern, and core-bar rammed up and ready forthewithdrawal of the pattern. Fig. 16 is a perspective view of 4a portionof the core-bar with a circular detachable end. Fig. 17 is across-section of the ilask and core-bar when the latter is rammed up intwo halves.

A A represent the pattern, which is necessarily in two or more parts. BB represent the two halves of the iiask. The interior of the patternrepresents in size and shape the interior size and shape of the proposedcasting, and the interior of this pattern really forms a core-box, inwhich the core is formed upon which the casting is made. Hthin each endof this two-part hollow patl tern corc-prints O C are fitted, which arein two parts, like the pattern, so that at each end these core-printsserveto govern the size ot' the mold beyond the ends of the pattern, andthe circular mold formed by these coreprints serves. when thecore-prints are removed, to receive the end ot the core and support itcentrally. D, Fig. 1, represents the ribbed core-bar, and D, Fig. 9,a'modication of' same. E, Fig. 2, represents the rammer when made to ramhalf the core in cases where the other half has been previously rammedbefore the ramming of the top part or cope of the flask, and E, Fig. 10,is the rammer when made to rain the entire body of' the core at one andthe same time. The corebar D is made with ribs d, extending radiallyTfrom it, to give it stiffness without much weight, to prevent sagging orrising of the core, the ribs also serving to enter and hold the body ofthe sand which forms the core.

In cases where it is preferred that one half' of the core shall berammed in the pattern, with the cope of' `the flask off, transverse ribsd may be used to assist in holding the sand; and in eases whereirregularity in configuration ofthe interior'of the castings arenecessary, transverse ribs c, which are detachable, may be used tosupport the sand to the outer extremities, or thereabout, of' suchirregularity or projection. A guide, d", is formed upon the top of' thecore-bar, over which the head e of the rammer E fits and slides, so thatthe rammer is guided properly in the ramming up of' the core. At one orboth ends of the core-bar flat projections F project, which areperforated atf, and made to rest upon Hat-topped plates G, secured to orin the bottoln part of the flask. Iins g project from the plate Gthrough the perforations f, and, by means of notches in these pins g,and keys Hite fit them, the projections F are made fast to the platesGr, and thus prevented from displacement. This feature is of importance,particularly for curved castings where the core-bar is neces sarilyother than straight. In cases where the core is to be rammed in whole atthe same time,

. one end of the core-bar is made with a projecting rod, I, so as topermit the introduction of the rammer E, Fig. l0. To support this end Iof the bar, the device shown in Fig. 1l is employed, which consists of aswinging plate, J, pivoted at i', and having' a curved seat, a, for thebar I to rest in, and a swinging and locking dog, K, to hold the bar Iin place, the dog being secured in the closed position by the pin L. Acurved slot and set-screw, M N, are devised to permit the plate to swingdown to allow of the barbeing entered. The ramm er E is provided withvent-wires ef, which, in the process of ramnnng, serve to leaveventapertures throughout the entire length of the core, as shown inFigs. 13, 6, and 15. When the rammer is removed, after the ramming up ofthe core, the detachable end D of' the core-bar is fitted on to supportthe sand at the end of the bar, this `detachable end having perforationsto match the detachable end in the core.

As indicated above, the core-bar can be rammed wholly by end ramming bythe use of the rammer, Fig. 10, or may be rammed in part horizontally,with the upper flask off, before the end rammer, Fig. 2, is used. In thelast-mentioned case, one halt' of' the pattern is first laid upon theusual follow-board, with the prints C in place. The lower part of' theflask is then placed over the pattern and prints, bottom up, and, whenthus placed, this part of the ask is rammed up, so as to form, in thisoperation, one half of the mold for the exterior of` the pipe or castingand the end molds around the prints for the core to fill up. rlhe flaskis then turned over and the core-bar, Fig. 1, secured in place. Theprints C are then removed, and partingsand 7 applied to the molds theyhave formed. Vhile this half' of the pattern is still in place, half ofthe core can be rammed up in the pattern and around the ribs d', thesand also tting the cavities formed by the prints. The upper half of thepattern is then laid on, and the upper core-prints also laid in place,when the upper part or cope of the flask is placed on and rammed up, soas to complete the exterior mold for the casting. The entire flask isthen turned upon end slightly and sand filled in the interior of thepattern endwise, and rammed up by the rammer E, Fig. 2, the action of'the rammer serving to force the core-print back into the position shownin the lower figure of' Fig. 12, so that the core can fill up the moldformed by the core-prints, as shown in that figure.

` When the core is completely rammed, the ventwires having, in theprocess, formed vent-apertures entirely through it, the other print isremoved and its vacancy rammed up after the introduction of' detachablehead D', so that the mold is then complete; and when the cope is liftedoff, 'so that the pat tern can be withdrawn from the sand, the moltenmetalmay be run in through the ordinary gate or gates O, provided in thesame.

When the core is to be rammed up entirely by end ramming, the process isthe same, except the entire ramming of the core is left until the ilasksare both rammed up; and the exterior mold for the casting is, in thiscase, formed before the remmer E, Fig. 10, is used at all, and beforeany part of the core is formed. The ribs d of the core-bar may beperforated to assist in the support of the sand,

.as shown.

I claimy 1. The combination of two-'part hollow pattern A A', detachableprints U C, and corebar I), substantially as and for the purposespeciiied.

2.` In combination with the core-bar D, having a. guide, 61', thereciprocating rammer E e, operating substantially as and for'tllepurpose specified.

3. In connection with the core-bar D, the flat perforated projectionsFf, plate G, having pins g, and key H, operating` substantially as andfor the purpose specified.

4. The remmer E e, provided with projecting,` vent-wires e', operatingsubstantially as and for the purpose specied.

5. In connection with the bar I of the core-bar, the swinging guides J KM N, connected and operating substantially as and for the purposespecified.

In 'testimonyr of .which invention I hereunto set my hand;

ROBERT J. HOWDON.

Witnesses:

FRANK MILLWARD, R. M. HUNTER.

